Uniform bounds for bilinear symbols with linear K-quasiconformally embedded singularity

Marco Fraccaroli, Olli Saari, Christoph Thiele

We prove bounds in the strict local $L^2({\mathbb{R}}^d)$ range for trilinear Fourier multiplier forms with a $d$-dimensional singular subspace. Given a fixed parameter $K\ge 1$…